DDF-94 null check for metadata field of metacards.
DDF-94 Added unit tests for how predicates handle null contextual data.  Added null checks into Contextual and Entry Predicates.
DDF-94 removed other potential NPE identified in code review.
DDF-94 additional unit tests for null operation.
DDF-93: added check to prevent adding sample update less than one second interval
DDF-92 Solr Catalog Provider getContentTypes returns content types whether or not they contain versions.
DDF-92 fixed code review comments
DDF-102: Making some fixes from code-review.

Removed some duplicate calls and updated some logging.
DDF-93: added unit test for skipping samples when delta time too small
DDF-93: changed log level to INFO
DDF-110: Updated CollectionPermission to have clear and addAll methods.
DDF-97: Updated CAS configurations to default to cas hostname.

Defaulting to cas meshes better with the documentation and does not assume cas is on same machine.
DDF-112: added support for unquoted filename parameter and Content-Disposition
header ending with semi-colon to the parsing of the content header
DDF-111: Refactor dynamic schema resolver constructor

The constructor was doing way too much work, and would have problems if
the server wasn't in a valid state.
DDF-113 - The REST endpoint can throw an IllegalArgumentException and stack trace back through CXF if a transformer fails - added catch block for exception
DDF-111: Add javadoc and remove exception, per code review
DDF-111: Move exception to a more appropriate location
DDF-114: Adding number to start of worksheet name to prevent duplicate names from occurring.
DDF-115: Set security log to DEBUG from INFO.
[maven-release-plugin] prepare release ddf-2.2.0.RC5